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Roentgenium (Rg)
Element with atomic number 111, category: Unknown, a solid at room temperature.
Element 111 of 118
Unknown
Roentgenium
Group 11, Period 7
Common Uses
Research
Electron Diagram
About Roentgenium
Roentgenium is a chemical element with the symbol Rg and atomic number 111, meaning every atom has 111 protons in its nucleus. It is classed as Unknown and is a solid at room temperature (estimated, never measured directly because this element decays within seconds). Its atomic mass is about 282 atomic mass units (u).
On the periodic table, Roentgenium sits in group 11, period 7, which determines how many electron shells it has and how it tends to react with other elements.
Uses of Roentgenium
In daily life and industry, Roentgenium is used for Research. These uses are closely tied to the typical properties of elements in the Unknown category.
Electron Structure of Roentgenium
Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Roentgenium has 7 electron shells, with an approximate arrangement of 2, 8, 18, 32, 32, 18, 1 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.
Explore Other Elements
Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.